If you disconnect the speaker wires from the speaker terminals on the amp and the amp still goes into protect mode, the amp probably has shorted output transistors. If that's the case, the amp is probably not repairable. The outputs that Sony used were discontinued and there are no other transistors that will work properly (unless some of the newest transistors are compatible).
If it's under warranty, contact Sony. If it's out of warranty, contact one of the authorized Sony service centers to see if they can help. They may have a supply of NOS parts that would work.
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